I started this project thinking that I would make the hotend air cooled. I realized pretty quickly that that wouldnt work very well for a number of reasons. If the filament path was centered in the heatsink, then there wouldnt be much of an issue with turning a decent heatsink. But since the filament path is not centered, turning it would be literally impossible. You can see here how difficult it would be to turn that.

I ended up switching to a new idea. Conduction! why have heatsink fins when you can have a big block of metal for a toolhead. ok very cool!

You can see the big block here ^^

The way the heatsink is mounted is pretty interesting IMO. I am using two SLM Titanium arms to connect the heatsink to the block. Since titanium has fairly low heat conductivity, its pretty perfect for this. The geometry also helps a lot with stopping excess heat from going into the block. You can see how everything connects together with m2 screws here.

I designed in some interesting geometry on the connector itself to try to minimise contact area between the block and the connector. it kinda looks like a castle.

Im using a standard v6 heatbreak in this hotend. It has a smooth side and a threaded side, which lets me use my fancy mounting style accurately. yay!

Total time spent: 4 hours